package com.sky.aop;

import com.sky.anotion.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * 公共字段自动填充切面
 */
@Aspect
@Component
@Slf4j
public class AutoFillAop {
    /**
     * 切入点
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.anotion.AutoFill)")
    public void autoFillPointcut() {}
    @Before("autoFillPointcut()")
    public void autoFill(JoinPoint joinPoint) {
        log.info("开始进行公共字段自动填充");
        MethodSignature signature = (MethodSignature)joinPoint.getSignature();
        // 获取注解对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);
        // 获得数据库操作类型
        OperationType operationType = autoFill.value();
        // 获得拦截方法的参数 --实体对象
        Object[] args = joinPoint.getArgs();
        if(args == null || args.length == 0) {
            return;
        }
        Object entity =  args[0];
        LocalDateTime now = LocalDateTime.now();
        String  currentId = BaseContext.getCurrentId();
        // 根据数据库操作类型进行操作
        if(operationType == OperationType.INSERT) {
            // 新增操作
            try {
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, String.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, String.class);
                // 通过反射为对象赋值
                setCreateTime.invoke(entity, now);
                setCreateUser.invoke(entity, currentId);
                setUpdateTime.invoke(entity, now);
                setUpdateUser.invoke(entity, currentId);
            } catch (Exception e) {
               e.printStackTrace();
            }
        }else if(operationType == OperationType.UPDATE) {
            // 修改操作
            try {
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, String.class);
                setUpdateTime.invoke(entity, now);
                setUpdateUser.invoke(entity, currentId);
            }catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}
